(defun return-one ()
  1)

(defun return-sum ((a integer) (b integer))
  (+ a b)
  )

(defun return-plus-two ((in integer))
  (+ in 2)
  )

(defun return-plus-three ((in integer))
  (+ 3 in)
  )

(+ 2 (return-one) (return-plus-three 2) (return-plus-two 3) (return-sum 1 2) (return-plus-two 3))